FR: Descriptions for labels/actions

[JohnM-M]

It would be really helpful to be able to add a sentence or two for each action to provide context for users as to what is happening/what the app is. This would be independent of the label and ideally displayed somewhere near the progress bar and step indicator. From the Mac Admins Slack conversation, space might be an issue. If that is the case, would it be possible to replace the redundant label step information underneath the status bar with a description?

Edit: Adding mockup example